Weaving Calculations
A guide to calculations relating to yarn and cloth and all processes of weaving.It includes reed count, reed width, Maximum EPI for a particular count, weave density, crimp percentage, cloth cover factor etc.
A guide to calculations relating to yarn and cloth and all processes of weaving.It includes reed count, reed width, Maximum EPI for a particular count, weave density, crimp percentage, cloth cover factor etc.
 Reed Count
It is calculated in stock port system.No. of dents in 2 inches is called Reed Count.
Reed Count = EPI/(1 + Weft crimp %age)  Reed Width
Reed Width = Cloth Width *(100+ weft crimp %age)/100  Crimp Percentage
Crimp %age = {(Warp length – Cloth length)/Cloth Length}* 100
Crimp %age = {(Warp width – Cloth width)/Cloth width}* 100  Cloth Cover Factor
 Cloth Cover Factor = Wp.C.F +Wt.C.F. – {(Wp.C.F. – Wt.C.F)/28}
 Maximum EPI for particular count
 other design = (Ends /Repeat * 1/Yarn Diametre)/ (No of intersections/repeat+ ends/repeat)
 Warp Density
= <350 Weave Density = 50+{(Warp Density – 100) * F.D – 100} /{(Weft Density – 100)* F.D – 100}
 Effective Weave Density = W. D x K of loom width x K of Design
= < 72
Wp / filling – K  Loom Width – K  Weave Design – K 

Cotton = 1.00  140 cm – 0.99  Plain1/1 = 1.00 
Polyester/Cotton = 1.03  180 cm – 1.00  Twill 1/2 = 0.87 
Viscose Filament = 1.17  190 cm – 1.01  Matt, Gabardine 2/2 = 0.82 
Polyester Filament = 1.22  220 cm – 1.02  Drill 1/3 = 0.77 
250 cm – 1.08  Satin 1/4 = 0.69  
330 cm – 1.15  
360 cm – 1.20 
To change the count and the number of thread/inch, keeping the same denseness of fabric
To change the count without altering the denseness of the fabric
EPI in Exp.cloth = (EPI in exp.Cloth^{2}/EPI in given cloth) * count in given cloth
To change the EPI without altering the denseness of the fabric
Warp requirement to weave the cloth
 Warp weight in grams /metre = {(Total Ends * 1.0936 * 453.59 * crimp %)/(840 * count)} * wastage %
 Weft weight in grams /metre ={(R.S. in inches * 453.59 * PPI)/(840 * count)} * wastage % * crimp %
 Cloth length in metres with given weft weight=( weft weight in kgs * weft count * 1848 * 0.9144)/(PPI * R.S in inches)
For silk and Polyester
 Warp weight in grams /metre ={(Total Ends * count (Denier) )/9000} * wastage % * crimp %
 Weft weight in grams /metre = {(R.S in inches * count(Denier)* PPI)/9000}* wastage % * crimp %
Allowance for count in bleached and Dyed fabric
1.Count becomes 4%
2. FinerDyed counts become max 6% Coarser
Fabric Production Calculation
 Loom Speed = Motor RPM * (Motor Pully Diametre)/(Loom Pully Diametre)
 Loom Effeciency Percentage = (Actual Production/Calculated Production )* 100
 Moisture Regain Percentage = {(Yarn Weight – Dried Yarn Weight)/Dried Yarn weight} * 100
 Moistue Content Percentage = {(Yarn Weight – Dried Yarn Weight)/Yarn weight} * 100
Type of Yarn  Moisture Regain %  Moisture Content % 

Cotton  8.50  7.83 
Jute  13.75  12.10 
Silk  11.00  9.91 
Rayon, Viscose  11.00  9.91 
Wool  17.00  14.50 
Nylon  4.20  3.78 

 Warp Weight in Kg = (Total Ends * Tape Length in meters)/(1693.6 * Warp Count)
 Weft Weight in Kg = (R.S in centimetres * cloth length in metres * PPI )/(4301.14 * weft Count)
 Cloth weight in GSM = {EPI/Warp Cout)+(PPI/Weft count)}* 25.6
 oz (ounce ) per sq. yard = GSM(Grams per sq. meter)/34
 Material Measurement
To calculate the length of any rolled fabrics, this formula gives the nearest accuracy.
L = {0.0655(Dd)(D+d)}/t
Where L = Length of material (Feet) t = Thickness of fabrics (inches)
D = Outside diameter (inches) d = Inside diameter (inches)  The weight of yarn in a cloth
The weight of cloth manufactured on looms depends upon the weight of yarns in the warp and weft: ends/inch, picks/inch and the weight of size on the warp. Therefore,
Cloth weight = Weight of warp + Weight of weft + Weight of size (All inlbs.)
Whereas Weight of warp in lbs. = (Total No. of Ends * Tape Length in Yards)/(840 * warp yarn count)
Also
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Naseer
+923008228350
U give me solution of EPI and PPI
EPI = Ends Per Inch
PPI = Pick Per Inch
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R.S. stands for Reed Space
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ppi calculat ..
Example .
Pick : 66
Insertions : 2
Pick×2= 132
(ppi = 132)
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What should be the width of dip fabric meant for tyre manufacturing to be maintained so that after rubber coating EPI will not change
Regards
Sunil
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Hi,
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Construction: 30×20+70D/…….×60=61″
GSM=139
EPI=????
EPI – Ends per Inch
PPI – pucks per Inch
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